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The 9 Sorts Of Computer Viruses To Look Out For & Exactly What They Do

Cliff Boodoosingh 12 March 2007 It is crucial to understand the differences among the types of hosting offered. As the Web hosting industry has matured, hosting offers have split into a few distinct categories, each with strengths and weaknesses. The host manages the server almost completely (though you maintain your site and your account). They can afford to charge you little since many clients are paying for use of the server. However, companies other than yours use the resources of that server. That means heavy traffic to one of the other sites on the server can hammer the performance of your site. Also, you typically are unable to install special software programs on these types of machines because the host will need to keep a stable environment for all of the clients using the server. Co-located hosting means that you buy a server from a hardware vendor, like Dell or HP, and you supply this server to the host. The Web host plugs your server into its network and its redundant power systems. The host is responsible for ensuring its network is available, and you are responsible for support and maintenance of your server. Good hosts offer management contracts to their co-location clients so that you can outsource much of the support to them and come to an arrangement similar to managed dedicated hosting. Most co-location hosts do not offer this service, however. You can find co-location providers we recommend at our Co-Location Hosting showcase. Unmanaged dedicated hosting is similar to co-location except that you lease a server from a host and do not own it yourself. Some very limited support (typically Web-based only) is included, but the level of support varies widely among unmanaged dedicated hosts. This type of server can be had for around $99/month. Support levels typically are provided only in general terms. Ask the host to go into specifics about what support it will provide will it apply security patches to your server? before signing up. This service is typically good for gaming servers (like Doom or Counterstrike servers) or hobbyist servers, but not for serious businesses that need responsive, expert-level service. Managed dedicated hosting means leasing a server from a host and having that company provide a robust level of support and maintenance on the server that is backed by quality guarantees. This maintenance typically includes services such as server uptime monitoring, a hardware warranty and security patch updates. Ensure that your managed dedicated host is specific about its managed services so that it does not disguise an unmanaged dedicated offering as a managed dedicated server. This has been known to happen, which is why it is important to do your homework and ask the right questions. You can find managed hosting providers we recommend, in our Managed Hosting showcase. This is excerpted from 9 Things to Know Before Selecting a Web Host by Chris Kivlehan, Marketing Manager at INetU Managed Hosting , Allentown, PA. He may be contacted at 610/266-7441 or at [email protected] . For the original version including any supplementary images or video, visit http://www.tophosts.com/what-type-of-web-hosting-do-you-need

Macro Virus A wide variety of programs, including productivity applications like Microsoft Excel, provide support for Macros special actions programmed into the document using a specific macro programming language. Unfortunately, this makes it possible for a virus to be hidden inside a seemingly benign document. Macro viruses very widely in terms of payload. The most well known macro virus is probably Melissa , a Word document supposedly containing the passwords to pornographic websites. The virus also exploited Words link to Microsoft Outlook in order to automatically email copies of itself. 6. Multipartite Virus While some viruses are happy to spread via one method or deliver a single payload, Multipartite viruses want it all. A virus of this type may spread in multiple ways, and it may take different actions on an infected computer depending on variables, such as the operating system installed or the existence of certain files. 7. Polymorphic Virus Another jack-of-all-trades, the Polymorphic virus actually mutates over time or after every execution, changing the code used to deliver its payload. Alternatively, or in addition, a Polymorphic virus may guard itself with an encryption algorithm that automatically alters itself when certain conditions are met. The goal of this trickery is evasion. Antivirus programs often find viruses by the specific code used. Obscuring or changing the code of a virus can help it avoid detection. 8. Resident Virus This broad virus definition applies to any virus that inserts itself into a systems memory. It then may take any number of actions and run independently of the file that was originally infected. A resident virus can be compared to a direct payload virus, which does not insert itself into the systems memory and therefore only takes action when an infected file is executed. 9. Web Scripting Virus Many websites execute complex code in order to provide interesting content. Displaying online video in your browser, for example, requires the execution of a specific code language that provides both the video itself and the player interface. Of course, this code can sometimes be exploited, making it possible for a virus to infect a computer or take actions on a computer through a website. Although malicious sites are sometimes created with purposely infected code, many such cases of virus exist because of code inserted into a site without the webmasters knowledge. Conclusion Ive included every type of computer virus in this article that I felt was relevant, but this isnt a list of every type of virus known to man. For the original version including any supplementary images or video, visit http://www.makeuseof.com/tag/types-computer-viruses-watch/